Static scheduling table generation method based on time-triggered Ethernet and avionics system

Abstract

The invention belongs to the technical field of avionics, and discloses a time-triggered Ethernet-based static scheduling table generation method and an avionics system. A porosity concept is introduced into a TT service static scheduling table generated by a traditional partition scheduling scheme; the centralized scheduling TT data frame service with the highest priority is dispersed and scheduled through a posteriori pore generation method; Scheduling and transmission are carried out on follow-up RC services through holes between TT services, a fast path selection algorithm is adopted for sequentially selecting paths for all TT communication tasks, and idle time slots meeting the scheduling and transmission requirements are selected for nodes in all sections of links passing through thefast path selection algorithm; And a TT static scheduling table is generated. According to the invention, the transmission delay and network jitter of the RC service are reduced, the occurrence of the situation that data frames compete for a physical link is avoided, and meanwhile, the time domain determinacy and stability of the avionics system based on the time-triggered Ethernet are ensured.

Description

technical field [0001] The invention belongs to the technical field of avionics, and in particular relates to a time-triggered Ethernet-based static schedule generation method and an avionics system. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: Time-Triggered Ethernet (Time-TriggeredEthernet, TTE) is an improved time-critical and safety-critical network applied in the aerospace field, which integrates real-time transmission of time-triggered Combining characteristics such as reliability, determinism, and fault tolerance with the flexibility and dynamics of traditional Ethernet "best effort transmission", it supports applications with mixed criticality requirements in the time domain. TTE has distributed network characteristics and a time-triggered mechanism, and is compatible with standard Ethernet and avionics full-duplex switched Ethernet (AFDX) networks, ensuring real-time data transmission, high securit...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problem existing in the existing technology is: applying the traditional partition scheduling to the static scheduling of the TTE network, it will centrally schedule the TT service, compress the length of the TT segment as much as possible to minimize the interval between them, and provide the subsequent RC The service spares more time resources for its transmission, which makes the time resources available for RC services fragmented seriously. When the TT message starts to be transmitted, the arriving RC service needs to go through a long queuing delay before it can start transmitting, causing RC The accumulation of business cannot meet the requirements of high real-time performance, high security and stability of avionics system for business scheduling

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